The Grinding Mill Rules

In recent years, with the rapid development of domestic construction, sand excavation can not satisfy the required amount for the construction sand. The use of construction sand are with a sharp rise, but the amount of natural sand was limited by the nature of river washing, therefore the expansion of river sand mining cause a risk in river flow and riverbed security. For the river flow safety, China have issued a nationwide ban on sand excavation, stipulated the time allowed for sand mining, and the amount has also been limited. However, the development of building results in the steep increaseing needs of sand and the sand price rises year after year, so the lack of natural sand force us to find a better way to solve the contradiction between sand shortage and construction needs. So for market demand and the conflict between supply and demand, came out the artificial sand. artificial sand for construction

The artificial sand are also called machine-made sand, it is collected rocks and diged river pebble from the river and by vertical shaft impact crusher (also known as sand making machine)processed, made them into sand for construction use. In 1990s, Zhejiang Province has already largely used the machine-made sand, and developed the relevant local standards, following Yunnan and Beijing. One after another, Beijing, Chongqing, Hunan and other places also has the sand production line.

It is an indisputable fact, that building sand as the basic materials of concrete, mortar and other ,machine-made sand is applied successfully. A large number of engineering practice (including the remarkable Three Gorges water conservancy) has demonstrated the possibility and the necessity of using the machine-made sand. wet ball mills for garnet powder

The Necessity of Dry Process Line Appears

By definition, artificial sand is to use machine to make sand, is by process of stone impact stone, stone impact metal inside sand making machine to make the stone into sand. Artificial sand particles are with rough surface, more angular, thus the aggregate combination with cement and with itself are good, the mechanical bite force is high, so the concrete strength of artificial sand is higher than concrete by natural sand. But in the process of the crushing stone, because of the fierce collision and the stone itself with a certain amount of mud, make artificial sand contains certain amount of stone and mud powder. The mud powder will seriously affect the sand graduation. And the stone powder can make up the shortcomings of artificial sand in concrete such as the large gap, large water demand, poor liquidity etc. To decrease the powder of sand, people learned the forming principle of river sand, manufactured sand washer, through which wash away the mud in sand , so that the artificial sand reach the standard of construction sand , this method is called wet processing line.

Therefore, the emergence of artificial sand scattered in the main river or water-rich areas, through the sand washing machine sand is washed away powder, so in this way, around the artificial sand production line must has abundant water resources, otherwise the manufactured sand can not meet building standards is still a waste pile.

In recent years, people after research found that stone powder if exist in a certain reasonable proportion in the artificial sand can increase the strength and workability of concrete. Mr. Chen Jialong, the engineering geologists, in the article "Rational Utilization Of Powder Sand" also clarified the importance of stone powder in artificial sand. However, when the sand washing machine wash away the mud in wet line, it also is wash away the stone powder. During sand washing, the wet line will not only wash away the 75 micron powder, also washed away the lager powder, including 150 micron, 300 micron, or even 600 microns. In this way, the advantages of artificial sand production line is vanished by the wet producing method. And this traditional way in making wet sand is constrained by water resources. In water scarce regions, and north area in cold winter, artificial sand is still not universally manufactured, the conflicts between supply and demand of building sand are still exist. Meanwhile, due to wet sand, water damage in those water-rich regions is even serious. It wasted water, and also caused certain water pollution, and on the other hand, washing away stone powder is a waste of mineral resources, and also destroyed the reasonable stone gradation, and not conducive to concrete workability. Therefore, in the case of multiple contradictions, must appears a new artificial sand processing method to meet the needs of the market and reduce the environmental pressure. tungsten grinding machine

Shanghai Shibang Machinery Co., Ltd. is the enterprise mainly produce various type of crushers and mills, through years of research and study of the artificial sand machine ,milling machine, and various artificial sands, and through the examine and analysis of each sand quarry, found sand could be get rid of the mud powder without relying on water sources , and save the stone powder from sand at the same time, thereby produced sand with higher quality. Nevertheless, the biggest difference of this artificial sand production from the traditional artificial sand is that one requires water, but the other one not, so we called this method as Dry Process Sand Production Line, this line has been promoted in Zhejiang area, and has been recognized by the market after customers experienced.